StopTech 13-18 Ford Focus ST AeroRotor 2pc Drilled Front Rotor (Pair)

StopTech Two-Piece AeroRotor and Hat Pair; Drilled. Features reduced unsprung and rotational mass, improved thermal capabilities, and optimized heat dissipation. Designed to work with OE calipers. AeroRotor Replacement Kits (ARK) replace factory rotors while retaining factory calipers. Although the same diameter and thickness as factory rotors, ARK offers improved cooling, braking, and handling. Directional, floating AeroRotors allow independent expansion of rotor and hat without "coning" due to elongated drive pin holes. ARK components include AeroRotor friction rings with patented internal vane design, pre-assembled to billet aluminum AeroHats with directional stand-offs for optimal cooling airflow. The patented AeroRotor vane design pushes up to 80% more air than factory rotors, leading to better cooling and reduced fade on the track. Aircraft-grade aluminum hats and 2-piece AeroRotors are up to 8 pounds lighter than stock rotors, contributing to faster acceleration, deceleration, and improved handling. Available in slotted or cross-drilled configurations. These slots or holes improve heat, friction material, and debris dissipation, ensuring fresh pad material consistently contacts the rotor during braking. An optional anti-corrosion, zinc finish is available for cold climates to prevent visible surface rust. StopTech AeroRotors are 100% made in the USA.